RAM(4) Linux Programmers Manual RAM(4)
ram - ram disk device
The ram device is a block device to access the ram disk in raw mode.
It is typically created by:
mknod -m 660 /dev/ram b 1 1
chown root:disk /dev/ram
chown(1), mknod(1), mount(8)
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Linux 1992-11-21 RAM(4)